Saint Patrick's Day is a public holiday in the Republic of Ireland and in Northern Ireland but it is celebrated all over the world because of Irish migrations.On St Patrick's Day It is customary to wear shamrocks and/or green clothing or accessories (the "wearing of the green").The colour green has been associated with Ireland since at least the 1640s. So you can go to an Irish pub and enjoy the atmosphere of this special celebration and visit the following websites where you can practise English through a cultural topic.
Here you can find online exercises of different levels, listenings and readings.
Video: ten curious things about St. Patricks' day.
Saint Patricks' day recipes.